Senior Software Engineer - Mercury Command

💼 Full-time💰 $189,700–$237,100🗓 2026-07-29 → 2026-09-29

Core

Design, build, and evolve an LLM-powered financial assistant (Command) that enables users to manage finances, send payments, and handle banking tasks via natural language.

Role type

Senior IC LLM application engineer (agentic workflows)

Builds

Command, Mercury's LLM-powered financial assistant

Domain

Fintech / Generative AI

Deliverable

production ML models | product features

Required skills

LLM-powered application development, agentic system design, multi-step workflow architecture, eval infrastructure, prompt engineering, TypeScript, Haskell

Preferred skills

Mentoring engineers, scaling LLM products, optimizing latency and cost, building trustworthy AI systems

Technologies

TypeScript, Haskell, LLMs

Responsibilities

Design and ship new Command skills for specific workflows, define agentic workflow architectures, own capabilities end-to-end from system prompt to frontend, maintain and evolve prompt architecture and policy layers, tune model behavior and streaming patterns, build and expand evaluation harnesses, partner with product and compliance to define correctness criteria

Seniority

Senior, hands-on IC

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About Mercury

Mercury is on a mission to defy those expectations. We're a financial technology company that helps startups spend less time banking* and more time building. We believe that the key to our success revolves around thoughtful design — and we hold the craft of that design to an exceptionally high standard. We're looking for a Staff Brand Designer who sets that bar: someone whose eye is so precise, and whose execution is so considered, that the work around them gets better just by virtue of their presence.